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   1 /*
   2  *  video.c - ACPI Video Driver ($Revision:$)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
   6  *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <linux/list.h>
  32 #include <linux/mutex.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/input.h>
  36 #include <linux/backlight.h>
  37 #include <linux/thermal.h>
  38 #include <linux/video_output.h>
  39 #include <asm/uaccess.h>
  40
  41 #include <acpi/acpi_bus.h>
  42 #include <acpi/acpi_drivers.h>
  43
  44 #define ACPI_VIDEO_COMPONENT            0x08000000
  45 #define ACPI_VIDEO_CLASS                "video"
  46 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  47 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  48 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  49 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  50 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  51 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  52 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  53
  54 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  55 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  56 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  57 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  58 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  59
  60 #define MAX_NAME_LEN    20
  61
  62 #define ACPI_VIDEO_DISPLAY_CRT  1
  63 #define ACPI_VIDEO_DISPLAY_TV   2
  64 #define ACPI_VIDEO_DISPLAY_DVI  3
  65 #define ACPI_VIDEO_DISPLAY_LCD  4
  66
  67 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  68 ACPI_MODULE_NAME("video");
  69
  70 MODULE_AUTHOR("Bruno Ducrot");
  71 MODULE_DESCRIPTION("ACPI Video Driver");
  72 MODULE_LICENSE("GPL");
  73
  74 static int brightness_switch_enabled = 1;
  75 module_param(brightness_switch_enabled, bool, 0644);
  76
  77 static int acpi_video_bus_add(struct acpi_device *device);
  78 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  79 static int acpi_video_resume(struct acpi_device *device);
  80
  81 static const struct acpi_device_id video_device_ids[] = {
  82         {ACPI_VIDEO_HID, 0},
  83         {"", 0},
  84 };
  85 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  86
  87 static struct acpi_driver acpi_video_bus = {
  88         .name = "video",
  89         .class = ACPI_VIDEO_CLASS,
  90         .ids = video_device_ids,
  91         .ops = {
  92                 .add = acpi_video_bus_add,
  93                 .remove = acpi_video_bus_remove,
  94                 .resume = acpi_video_resume,
  95                 },
  96 };
  97
  98 struct acpi_video_bus_flags {
  99         u8 multihead:1;         /* can switch video heads */
 100         u8 rom:1;               /* can retrieve a video rom */
 101         u8 post:1;              /* can configure the head to */
 102         u8 reserved:5;
 103 };
 104
 105 struct acpi_video_bus_cap {
 106         u8 _DOS:1;              /*Enable/Disable output switching */
 107         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 108         u8 _ROM:1;              /*Get ROM Data */
 109         u8 _GPD:1;              /*Get POST Device */
 110         u8 _SPD:1;              /*Set POST Device */
 111         u8 _VPO:1;              /*Video POST Options */
 112         u8 reserved:2;
 113 };
 114
 115 struct acpi_video_device_attrib {
 116         u32 display_index:4;    /* A zero-based instance of the Display */
 117         u32 display_port_attachment:4;  /*This field differentiates the display type */
 118         u32 display_type:4;     /*Describe the specific type in use */
 119         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 120         u32 bios_can_detect:1;  /*BIOS can detect the device */
 121         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 122                                    the VGA device. */
 123         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 124         u32 reserved:10;        /*Must be 0 */
 125         u32 device_id_scheme:1; /*Device ID Scheme */
 126 };
 127
 128 struct acpi_video_enumerated_device {
 129         union {
 130                 u32 int_val;
 131                 struct acpi_video_device_attrib attrib;
 132         } value;
 133         struct acpi_video_device *bind_info;
 134 };
 135
 136 struct acpi_video_bus {
 137         struct acpi_device *device;
 138         u8 dos_setting;
 139         struct acpi_video_enumerated_device *attached_array;
 140         u8 attached_count;
 141         struct acpi_video_bus_cap cap;
 142         struct acpi_video_bus_flags flags;
 143         struct list_head video_device_list;
 144         struct mutex device_list_lock;  /* protects video_device_list */
 145         struct proc_dir_entry *dir;
 146         struct input_dev *input;
 147         char phys[32];  /* for input device */
 148 };
 149
 150 struct acpi_video_device_flags {
 151         u8 crt:1;
 152         u8 lcd:1;
 153         u8 tvout:1;
 154         u8 dvi:1;
 155         u8 bios:1;
 156         u8 unknown:1;
 157         u8 reserved:2;
 158 };
 159
 160 struct acpi_video_device_cap {
 161         u8 _ADR:1;              /*Return the unique ID */
 162         u8 _BCL:1;              /*Query list of brightness control levels supported */
 163         u8 _BCM:1;              /*Set the brightness level */
 164         u8 _BQC:1;              /* Get current brightness level */
 165         u8 _DDC:1;              /*Return the EDID for this device */
 166         u8 _DCS:1;              /*Return status of output device */
 167         u8 _DGS:1;              /*Query graphics state */
 168         u8 _DSS:1;              /*Device state set */
 169 };
 170
 171 struct acpi_video_device_brightness {
 172         int curr;
 173         int count;
 174         int *levels;
 175 };
 176
 177 struct acpi_video_device {
 178         unsigned long device_id;
 179         struct acpi_video_device_flags flags;
 180         struct acpi_video_device_cap cap;
 181         struct list_head entry;
 182         struct acpi_video_bus *video;
 183         struct acpi_device *dev;
 184         struct acpi_video_device_brightness *brightness;
 185         struct backlight_device *backlight;
 186         struct thermal_cooling_device *cdev;
 187         struct output_device *output_dev;
 188 };
 189
 190 /* bus */
 191 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 192 static struct file_operations acpi_video_bus_info_fops = {
 193         .owner = THIS_MODULE,
 194         .open = acpi_video_bus_info_open_fs,
 195         .read = seq_read,
 196         .llseek = seq_lseek,
 197         .release = single_release,
 198 };
 199
 200 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 201 static struct file_operations acpi_video_bus_ROM_fops = {
 202         .owner = THIS_MODULE,
 203         .open = acpi_video_bus_ROM_open_fs,
 204         .read = seq_read,
 205         .llseek = seq_lseek,
 206         .release = single_release,
 207 };
 208
 209 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 210                                             struct file *file);
 211 static struct file_operations acpi_video_bus_POST_info_fops = {
 212         .owner = THIS_MODULE,
 213         .open = acpi_video_bus_POST_info_open_fs,
 214         .read = seq_read,
 215         .llseek = seq_lseek,
 216         .release = single_release,
 217 };
 218
 219 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 220 static struct file_operations acpi_video_bus_POST_fops = {
 221         .owner = THIS_MODULE,
 222         .open = acpi_video_bus_POST_open_fs,
 223         .read = seq_read,
 224         .llseek = seq_lseek,
 225         .release = single_release,
 226 };
 227
 228 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 229 static struct file_operations acpi_video_bus_DOS_fops = {
 230         .owner = THIS_MODULE,
 231         .open = acpi_video_bus_DOS_open_fs,
 232         .read = seq_read,
 233         .llseek = seq_lseek,
 234         .release = single_release,
 235 };
 236
 237 /* device */
 238 static int acpi_video_device_info_open_fs(struct inode *inode,
 239                                           struct file *file);
 240 static struct file_operations acpi_video_device_info_fops = {
 241         .owner = THIS_MODULE,
 242         .open = acpi_video_device_info_open_fs,
 243         .read = seq_read,
 244         .llseek = seq_lseek,
 245         .release = single_release,
 246 };
 247
 248 static int acpi_video_device_state_open_fs(struct inode *inode,
 249                                            struct file *file);
 250 static struct file_operations acpi_video_device_state_fops = {
 251         .owner = THIS_MODULE,
 252         .open = acpi_video_device_state_open_fs,
 253         .read = seq_read,
 254         .llseek = seq_lseek,
 255         .release = single_release,
 256 };
 257
 258 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 259                                                 struct file *file);
 260 static struct file_operations acpi_video_device_brightness_fops = {
 261         .owner = THIS_MODULE,
 262         .open = acpi_video_device_brightness_open_fs,
 263         .read = seq_read,
 264         .llseek = seq_lseek,
 265         .release = single_release,
 266 };
 267
 268 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 269                                           struct file *file);
 270 static struct file_operations acpi_video_device_EDID_fops = {
 271         .owner = THIS_MODULE,
 272         .open = acpi_video_device_EDID_open_fs,
 273         .read = seq_read,
 274         .llseek = seq_lseek,
 275         .release = single_release,
 276 };
 277
 278 static char device_decode[][30] = {
 279         "motherboard VGA device",
 280         "PCI VGA device",
 281         "AGP VGA device",
 282         "UNKNOWN",
 283 };
 284
 285 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 286 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 287 static void acpi_video_device_bind(struct acpi_video_bus *video,
 288                                    struct acpi_video_device *device);
 289 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 290 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 291                         int level);
 292 static int acpi_video_device_lcd_get_level_current(
 293                         struct acpi_video_device *device,
 294                         unsigned long *level);
 295 static int acpi_video_get_next_level(struct acpi_video_device *device,
 296                                      u32 level_current, u32 event);
 297 static void acpi_video_switch_brightness(struct acpi_video_device *device,
 298                                          int event);
 299 static int acpi_video_device_get_state(struct acpi_video_device *device,
 300                             unsigned long *state);
 301 static int acpi_video_output_get(struct output_device *od);
 302 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 303
 304 /*backlight device sysfs support*/
 305 static int acpi_video_get_brightness(struct backlight_device *bd)
 306 {
 307         unsigned long cur_level;
 308         int i;
 309         struct acpi_video_device *vd =
 310                 (struct acpi_video_device *)bl_get_data(bd);
 311         acpi_video_device_lcd_get_level_current(vd, &cur_level);
 312         for (i = 2; i < vd->brightness->count; i++) {
 313                 if (vd->brightness->levels[i] == cur_level)
 314                         /* The first two entries are special - see page 575
 315                            of the ACPI spec 3.0 */
 316                         return i-2;
 317         }
 318         return 0;
 319 }
 320
 321 static int acpi_video_set_brightness(struct backlight_device *bd)
 322 {
 323         int request_level = bd->props.brightness+2;
 324         struct acpi_video_device *vd =
 325                 (struct acpi_video_device *)bl_get_data(bd);
 326         acpi_video_device_lcd_set_level(vd,
 327                                         vd->brightness->levels[request_level]);
 328         return 0;
 329 }
 330
 331 static struct backlight_ops acpi_backlight_ops = {
 332         .get_brightness = acpi_video_get_brightness,
 333         .update_status  = acpi_video_set_brightness,
 334 };
 335
 336 /*video output device sysfs support*/
 337 static int acpi_video_output_get(struct output_device *od)
 338 {
 339         unsigned long state;
 340         struct acpi_video_device *vd =
 341                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 342         acpi_video_device_get_state(vd, &state);
 343         return (int)state;
 344 }
 345
 346 static int acpi_video_output_set(struct output_device *od)
 347 {
 348         unsigned long state = od->request_state;
 349         struct acpi_video_device *vd=
 350                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 351         return acpi_video_device_set_state(vd, state);
 352 }
 353
 354 static struct output_properties acpi_output_properties = {
 355         .set_state = acpi_video_output_set,
 356         .get_status = acpi_video_output_get,
 357 };
 358
 359
 360 /* thermal cooling device callbacks */
 361 static int video_get_max_state(struct thermal_cooling_device *cdev, char *buf)
 362 {
 363         struct acpi_device *device = cdev->devdata;
 364         struct acpi_video_device *video = acpi_driver_data(device);
 365
 366         return sprintf(buf, "%d\n", video->brightness->count - 3);
 367 }
 368
 369 static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
 370 {
 371         struct acpi_device *device = cdev->devdata;
 372         struct acpi_video_device *video = acpi_driver_data(device);
 373         unsigned long level;
 374         int state;
 375
 376         acpi_video_device_lcd_get_level_current(video, &level);
 377         for (state = 2; state < video->brightness->count; state++)
 378                 if (level == video->brightness->levels[state])
 379                         return sprintf(buf, "%d\n",
 380                                        video->brightness->count - state - 1);
 381
 382         return -EINVAL;
 383 }
 384
 385 static int
 386 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
 387 {
 388         struct acpi_device *device = cdev->devdata;
 389         struct acpi_video_device *video = acpi_driver_data(device);
 390         int level;
 391
 392         if ( state >= video->brightness->count - 2)
 393                 return -EINVAL;
 394
 395         state = video->brightness->count - state;
 396         level = video->brightness->levels[state -1];
 397         return acpi_video_device_lcd_set_level(video, level);
 398 }
 399
 400 static struct thermal_cooling_device_ops video_cooling_ops = {
 401         .get_max_state = video_get_max_state,
 402         .get_cur_state = video_get_cur_state,
 403         .set_cur_state = video_set_cur_state,
 404 };
 405
 406 /* --------------------------------------------------------------------------
 407                                Video Management
 408    -------------------------------------------------------------------------- */
 409
 410 /* device */
 411
 412 static int
 413 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
 414 {
 415         int status;
 416
 417         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 418
 419         return status;
 420 }
 421
 422 static int
 423 acpi_video_device_get_state(struct acpi_video_device *device,
 424                             unsigned long *state)
 425 {
 426         int status;
 427
 428         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 429
 430         return status;
 431 }
 432
 433 static int
 434 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 435 {
 436         int status;
 437         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 438         struct acpi_object_list args = { 1, &arg0 };
 439         unsigned long ret;
 440
 441
 442         arg0.integer.value = state;
 443         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 444
 445         return status;
 446 }
 447
 448 static int
 449 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 450                                    union acpi_object **levels)
 451 {
 452         int status;
 453         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 454         union acpi_object *obj;
 455
 456
 457         *levels = NULL;
 458
 459         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 460         if (!ACPI_SUCCESS(status))
 461                 return status;
 462         obj = (union acpi_object *)buffer.pointer;
 463         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 464                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 465                 status = -EFAULT;
 466                 goto err;
 467         }
 468
 469         *levels = obj;
 470
 471         return 0;
 472
 473       err:
 474         kfree(buffer.pointer);
 475
 476         return status;
 477 }
 478
 479 static int
 480 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 481 {
 482         int status = AE_OK;
 483         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 484         struct acpi_object_list args = { 1, &arg0 };
 485
 486
 487         arg0.integer.value = level;
 488
 489         if (device->cap._BCM)
 490                 status = acpi_evaluate_object(device->dev->handle, "_BCM",
 491                                               &args, NULL);
 492         device->brightness->curr = level;
 493         return status;
 494 }
 495
 496 static int
 497 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 498                                         unsigned long *level)
 499 {
 500         if (device->cap._BQC)
 501                 return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
 502                                              level);
 503         *level = device->brightness->curr;
 504         return AE_OK;
 505 }
 506
 507 static int
 508 acpi_video_device_EDID(struct acpi_video_device *device,
 509                        union acpi_object **edid, ssize_t length)
 510 {
 511         int status;
 512         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 513         union acpi_object *obj;
 514         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 515         struct acpi_object_list args = { 1, &arg0 };
 516
 517
 518         *edid = NULL;
 519
 520         if (!device)
 521                 return -ENODEV;
 522         if (length == 128)
 523                 arg0.integer.value = 1;
 524         else if (length == 256)
 525                 arg0.integer.value = 2;
 526         else
 527                 return -EINVAL;
 528
 529         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 530         if (ACPI_FAILURE(status))
 531                 return -ENODEV;
 532
 533         obj = buffer.pointer;
 534
 535         if (obj && obj->type == ACPI_TYPE_BUFFER)
 536                 *edid = obj;
 537         else {
 538                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 539                 status = -EFAULT;
 540                 kfree(obj);
 541         }
 542
 543         return status;
 544 }
 545
 546 /* bus */
 547
 548 static int
 549 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 550 {
 551         int status;
 552         unsigned long tmp;
 553         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 554         struct acpi_object_list args = { 1, &arg0 };
 555
 556
 557         arg0.integer.value = option;
 558
 559         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 560         if (ACPI_SUCCESS(status))
 561                 status = tmp ? (-EINVAL) : (AE_OK);
 562
 563         return status;
 564 }
 565
 566 static int
 567 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
 568 {
 569         int status;
 570
 571         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 572
 573         return status;
 574 }
 575
 576 static int
 577 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 578                             unsigned long *options)
 579 {
 580         int status;
 581
 582         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 583         *options &= 3;
 584
 585         return status;
 586 }
 587
 588 /*
 589  *  Arg:
 590  *      video           : video bus device pointer
 591  *      bios_flag       :
 592  *              0.      The system BIOS should NOT automatically switch(toggle)
 593  *                      the active display output.
 594  *              1.      The system BIOS should automatically switch (toggle) the
 595  *                      active display output. No switch event.
 596  *              2.      The _DGS value should be locked.
 597  *              3.      The system BIOS should not automatically switch (toggle) the
 598  *                      active display output, but instead generate the display switch
 599  *                      event notify code.
 600  *      lcd_flag        :
 601  *              0.      The system BIOS should automatically control the brightness level
 602  *                      of the LCD when the power changes from AC to DC
 603  *              1.      The system BIOS should NOT automatically control the brightness
 604  *                      level of the LCD when the power changes from AC to DC.
 605  * Return Value:
 606  *              -1      wrong arg.
 607  */
 608
 609 static int
 610 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 611 {
 612         acpi_integer status = 0;
 613         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 614         struct acpi_object_list args = { 1, &arg0 };
 615
 616
 617         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 618                 status = -1;
 619                 goto Failed;
 620         }
 621         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 622         video->dos_setting = arg0.integer.value;
 623         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 624
 625       Failed:
 626         return status;
 627 }
 628
 629 /*
 630  *  Arg:
 631  *      device  : video output device (LCD, CRT, ..)
 632  *
 633  *  Return Value:
 634  *      Maximum brightness level
 635  *
 636  *  Allocate and initialize device->brightness.
 637  */
 638
 639 static int
 640 acpi_video_init_brightness(struct acpi_video_device *device)
 641 {
 642         union acpi_object *obj = NULL;
 643         int i, max_level = 0, count = 0;
 644         union acpi_object *o;
 645         struct acpi_video_device_brightness *br = NULL;
 646
 647         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 648                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 649                                                 "LCD brightness level\n"));
 650                 goto out;
 651         }
 652
 653         if (obj->package.count < 2)
 654                 goto out;
 655
 656         br = kzalloc(sizeof(*br), GFP_KERNEL);
 657         if (!br) {
 658                 printk(KERN_ERR "can't allocate memory\n");
 659                 goto out;
 660         }
 661
 662         br->levels = kmalloc(obj->package.count * sizeof *(br->levels),
 663                                 GFP_KERNEL);
 664         if (!br->levels)
 665                 goto out_free;
 666
 667         for (i = 0; i < obj->package.count; i++) {
 668                 o = (union acpi_object *)&obj->package.elements[i];
 669                 if (o->type != ACPI_TYPE_INTEGER) {
 670                         printk(KERN_ERR PREFIX "Invalid data\n");
 671                         continue;
 672                 }
 673                 br->levels[count] = (u32) o->integer.value;
 674
 675                 if (br->levels[count] > max_level)
 676                         max_level = br->levels[count];
 677                 count++;
 678         }
 679
 680         if (count < 2)
 681                 goto out_free_levels;
 682
 683         br->count = count;
 684         device->brightness = br;
 685         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "found %d brightness levels\n", count));
 686         kfree(obj);
 687         return max_level;
 688
 689 out_free_levels:
 690         kfree(br->levels);
 691 out_free:
 692         kfree(br);
 693 out:
 694         device->brightness = NULL;
 695         kfree(obj);
 696         return 0;
 697 }
 698
 699 /*
 700  *  Arg:
 701  *      device  : video output device (LCD, CRT, ..)
 702  *
 703  *  Return Value:
 704  *      None
 705  *
 706  *  Find out all required AML methods defined under the output
 707  *  device.
 708  */
 709
 710 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 711 {
 712         acpi_handle h_dummy1;
 713         u32 max_level = 0;
 714
 715
 716         memset(&device->cap, 0, sizeof(device->cap));
 717
 718         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 719                 device->cap._ADR = 1;
 720         }
 721         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 722                 device->cap._BCL = 1;
 723         }
 724         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 725                 device->cap._BCM = 1;
 726         }
 727         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 728                 device->cap._BQC = 1;
 729         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 730                 device->cap._DDC = 1;
 731         }
 732         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 733                 device->cap._DCS = 1;
 734         }
 735         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 736                 device->cap._DGS = 1;
 737         }
 738         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 739                 device->cap._DSS = 1;
 740         }
 741
 742         max_level = acpi_video_init_brightness(device);
 743
 744         if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
 745                 int result;
 746                 static int count = 0;
 747                 char *name;
 748                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 749                 if (!name)
 750                         return;
 751
 752                 sprintf(name, "acpi_video%d", count++);
 753                 device->backlight = backlight_device_register(name,
 754                         NULL, device, &acpi_backlight_ops);
 755                 device->backlight->props.max_brightness = device->brightness->count-3;
 756                 device->backlight->props.brightness = acpi_video_get_brightness(device->backlight);
 757                 backlight_update_status(device->backlight);
 758                 kfree(name);
 759
 760                 device->cdev = thermal_cooling_device_register("LCD",
 761                                         device->dev, &video_cooling_ops);
 762                 if (IS_ERR(device->cdev))
 763                         return;
 764
 765                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 766                          device->cdev->id);
 767                 result = sysfs_create_link(&device->dev->dev.kobj,
 768                                 &device->cdev->device.kobj,
 769                                 "thermal_cooling");
 770                 if (result)
 771                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 772                 result = sysfs_create_link(&device->cdev->device.kobj,
 773                                 &device->dev->dev.kobj, "device");
 774                 if (result)
 775                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 776
 777         }
 778         if (device->cap._DCS && device->cap._DSS){
 779                 static int count = 0;
 780                 char *name;
 781                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 782                 if (!name)
 783                         return;
 784                 sprintf(name, "acpi_video%d", count++);
 785                 device->output_dev = video_output_register(name,
 786                                 NULL, device, &acpi_output_properties);
 787                 kfree(name);
 788         }
 789         return;
 790 }
 791
 792 /*
 793  *  Arg:
 794  *      device  : video output device (VGA)
 795  *
 796  *  Return Value:
 797  *      None
 798  *
 799  *  Find out all required AML methods defined under the video bus device.
 800  */
 801
 802 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 803 {
 804         acpi_handle h_dummy1;
 805
 806         memset(&video->cap, 0, sizeof(video->cap));
 807         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 808                 video->cap._DOS = 1;
 809         }
 810         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 811                 video->cap._DOD = 1;
 812         }
 813         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 814                 video->cap._ROM = 1;
 815         }
 816         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 817                 video->cap._GPD = 1;
 818         }
 819         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 820                 video->cap._SPD = 1;
 821         }
 822         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 823                 video->cap._VPO = 1;
 824         }
 825 }
 826
 827 /*
 828  * Check whether the video bus device has required AML method to
 829  * support the desired features
 830  */
 831
 832 static int acpi_video_bus_check(struct acpi_video_bus *video)
 833 {
 834         acpi_status status = -ENOENT;
 835
 836
 837         if (!video)
 838                 return -EINVAL;
 839
 840         /* Since there is no HID, CID and so on for VGA driver, we have
 841          * to check well known required nodes.
 842          */
 843
 844         /* Does this device support video switching? */
 845         if (video->cap._DOS) {
 846                 video->flags.multihead = 1;
 847                 status = 0;
 848         }
 849
 850         /* Does this device support retrieving a video ROM? */
 851         if (video->cap._ROM) {
 852                 video->flags.rom = 1;
 853                 status = 0;
 854         }
 855
 856         /* Does this device support configuring which video device to POST? */
 857         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 858                 video->flags.post = 1;
 859                 status = 0;
 860         }
 861
 862         return status;
 863 }
 864
 865 /* --------------------------------------------------------------------------
 866                               FS Interface (/proc)
 867    -------------------------------------------------------------------------- */
 868
 869 static struct proc_dir_entry *acpi_video_dir;
 870
 871 /* video devices */
 872
 873 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
 874 {
 875         struct acpi_video_device *dev = seq->private;
 876
 877
 878         if (!dev)
 879                 goto end;
 880
 881         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 882         seq_printf(seq, "type:         ");
 883         if (dev->flags.crt)
 884                 seq_printf(seq, "CRT\n");
 885         else if (dev->flags.lcd)
 886                 seq_printf(seq, "LCD\n");
 887         else if (dev->flags.tvout)
 888                 seq_printf(seq, "TVOUT\n");
 889         else if (dev->flags.dvi)
 890                 seq_printf(seq, "DVI\n");
 891         else
 892                 seq_printf(seq, "UNKNOWN\n");
 893
 894         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
 895
 896       end:
 897         return 0;
 898 }
 899
 900 static int
 901 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
 902 {
 903         return single_open(file, acpi_video_device_info_seq_show,
 904                            PDE(inode)->data);
 905 }
 906
 907 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
 908 {
 909         int status;
 910         struct acpi_video_device *dev = seq->private;
 911         unsigned long state;
 912
 913
 914         if (!dev)
 915                 goto end;
 916
 917         status = acpi_video_device_get_state(dev, &state);
 918         seq_printf(seq, "state:     ");
 919         if (ACPI_SUCCESS(status))
 920                 seq_printf(seq, "0x%02lx\n", state);
 921         else
 922                 seq_printf(seq, "<not supported>\n");
 923
 924         status = acpi_video_device_query(dev, &state);
 925         seq_printf(seq, "query:     ");
 926         if (ACPI_SUCCESS(status))
 927                 seq_printf(seq, "0x%02lx\n", state);
 928         else
 929                 seq_printf(seq, "<not supported>\n");
 930
 931       end:
 932         return 0;
 933 }
 934
 935 static int
 936 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
 937 {
 938         return single_open(file, acpi_video_device_state_seq_show,
 939                            PDE(inode)->data);
 940 }
 941
 942 static ssize_t
 943 acpi_video_device_write_state(struct file *file,
 944                               const char __user * buffer,
 945                               size_t count, loff_t * data)
 946 {
 947         int status;
 948         struct seq_file *m = file->private_data;
 949         struct acpi_video_device *dev = m->private;
 950         char str[12] = { 0 };
 951         u32 state = 0;
 952
 953
 954         if (!dev || count + 1 > sizeof str)
 955                 return -EINVAL;
 956
 957         if (copy_from_user(str, buffer, count))
 958                 return -EFAULT;
 959
 960         str[count] = 0;
 961         state = simple_strtoul(str, NULL, 0);
 962         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
 963
 964         status = acpi_video_device_set_state(dev, state);
 965
 966         if (status)
 967                 return -EFAULT;
 968
 969         return count;
 970 }
 971
 972 static int
 973 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
 974 {
 975         struct acpi_video_device *dev = seq->private;
 976         int i;
 977
 978
 979         if (!dev || !dev->brightness) {
 980                 seq_printf(seq, "<not supported>\n");
 981                 return 0;
 982         }
 983
 984         seq_printf(seq, "levels: ");
 985         for (i = 0; i < dev->brightness->count; i++)
 986                 seq_printf(seq, " %d", dev->brightness->levels[i]);
 987         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
 988
 989         return 0;
 990 }
 991
 992 static int
 993 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
 994 {
 995         return single_open(file, acpi_video_device_brightness_seq_show,
 996                            PDE(inode)->data);
 997 }
 998
 999 static ssize_t
1000 acpi_video_device_write_brightness(struct file *file,
1001                                    const char __user * buffer,
1002                                    size_t count, loff_t * data)
1003 {
1004         struct seq_file *m = file->private_data;
1005         struct acpi_video_device *dev = m->private;
1006         char str[5] = { 0 };
1007         unsigned int level = 0;
1008         int i;
1009
1010
1011         if (!dev || !dev->brightness || count + 1 > sizeof str)
1012                 return -EINVAL;
1013
1014         if (copy_from_user(str, buffer, count))
1015                 return -EFAULT;
1016
1017         str[count] = 0;
1018         level = simple_strtoul(str, NULL, 0);
1019
1020         if (level > 100)
1021                 return -EFAULT;
1022
1023         /* validate through the list of available levels */
1024         for (i = 0; i < dev->brightness->count; i++)
1025                 if (level == dev->brightness->levels[i]) {
1026                         if (ACPI_SUCCESS
1027                             (acpi_video_device_lcd_set_level(dev, level)))
1028                                 dev->brightness->curr = level;
1029                         break;
1030                 }
1031
1032         return count;
1033 }
1034
1035 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1036 {
1037         struct acpi_video_device *dev = seq->private;
1038         int status;
1039         int i;
1040         union acpi_object *edid = NULL;
1041
1042
1043         if (!dev)
1044                 goto out;
1045
1046         status = acpi_video_device_EDID(dev, &edid, 128);
1047         if (ACPI_FAILURE(status)) {
1048                 status = acpi_video_device_EDID(dev, &edid, 256);
1049         }
1050
1051         if (ACPI_FAILURE(status)) {
1052                 goto out;
1053         }
1054
1055         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1056                 for (i = 0; i < edid->buffer.length; i++)
1057                         seq_putc(seq, edid->buffer.pointer[i]);
1058         }
1059
1060       out:
1061         if (!edid)
1062                 seq_printf(seq, "<not supported>\n");
1063         else
1064                 kfree(edid);
1065
1066         return 0;
1067 }
1068
1069 static int
1070 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1071 {
1072         return single_open(file, acpi_video_device_EDID_seq_show,
1073                            PDE(inode)->data);
1074 }
1075
1076 static int acpi_video_device_add_fs(struct acpi_device *device)
1077 {
1078         struct proc_dir_entry *entry, *device_dir;
1079         struct acpi_video_device *vid_dev;
1080
1081         vid_dev = acpi_driver_data(device);
1082         if (!vid_dev)
1083                 return -ENODEV;
1084
1085         device_dir = proc_mkdir(acpi_device_bid(device),
1086                                 vid_dev->video->dir);
1087         if (!device_dir)
1088                 return -ENOMEM;
1089
1090         device_dir->owner = THIS_MODULE;
1091
1092         /* 'info' [R] */
1093         entry = proc_create_data("info", S_IRUGO, device_dir,
1094                         &acpi_video_device_info_fops, acpi_driver_data(device));
1095         if (!entry)
1096                 goto err_remove_dir;
1097
1098         /* 'state' [R/W] */
1099         acpi_video_device_state_fops.write = acpi_video_device_write_state;
1100         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1101                                  device_dir,
1102                                  &acpi_video_device_state_fops,
1103                                  acpi_driver_data(device));
1104         if (!entry)
1105                 goto err_remove_info;
1106
1107         /* 'brightness' [R/W] */
1108         acpi_video_device_brightness_fops.write =
1109                 acpi_video_device_write_brightness;
1110         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1111                                  device_dir,
1112                                  &acpi_video_device_brightness_fops,
1113                                  acpi_driver_data(device));
1114         if (!entry)
1115                 goto err_remove_state;
1116
1117         /* 'EDID' [R] */
1118         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1119                                  &acpi_video_device_EDID_fops,
1120                                  acpi_driver_data(device));
1121         if (!entry)
1122                 goto err_remove_brightness;
1123
1124         acpi_device_dir(device) = device_dir;
1125
1126         return 0;
1127
1128  err_remove_brightness:
1129         remove_proc_entry("brightness", device_dir);
1130  err_remove_state:
1131         remove_proc_entry("state", device_dir);
1132  err_remove_info:
1133         remove_proc_entry("info", device_dir);
1134  err_remove_dir:
1135         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1136         return -ENOMEM;
1137 }
1138
1139 static int acpi_video_device_remove_fs(struct acpi_device *device)
1140 {
1141         struct acpi_video_device *vid_dev;
1142         struct proc_dir_entry *device_dir;
1143
1144         vid_dev = acpi_driver_data(device);
1145         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1146                 return -ENODEV;
1147
1148         device_dir = acpi_device_dir(device);
1149         if (device_dir) {
1150                 remove_proc_entry("info", device_dir);
1151                 remove_proc_entry("state", device_dir);
1152                 remove_proc_entry("brightness", device_dir);
1153                 remove_proc_entry("EDID", device_dir);
1154                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1155                 acpi_device_dir(device) = NULL;
1156         }
1157
1158         return 0;
1159 }
1160
1161 /* video bus */
1162 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1163 {
1164         struct acpi_video_bus *video = seq->private;
1165
1166
1167         if (!video)
1168                 goto end;
1169
1170         seq_printf(seq, "Switching heads:              %s\n",
1171                    video->flags.multihead ? "yes" : "no");
1172         seq_printf(seq, "Video ROM:                    %s\n",
1173                    video->flags.rom ? "yes" : "no");
1174         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1175                    video->flags.post ? "yes" : "no");
1176
1177       end:
1178         return 0;
1179 }
1180
1181 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1182 {
1183         return single_open(file, acpi_video_bus_info_seq_show,
1184                            PDE(inode)->data);
1185 }
1186
1187 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1188 {
1189         struct acpi_video_bus *video = seq->private;
1190
1191
1192         if (!video)
1193                 goto end;
1194
1195         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1196         seq_printf(seq, "<TODO>\n");
1197
1198       end:
1199         return 0;
1200 }
1201
1202 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1203 {
1204         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1205 }
1206
1207 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1208 {
1209         struct acpi_video_bus *video = seq->private;
1210         unsigned long options;
1211         int status;
1212
1213
1214         if (!video)
1215                 goto end;
1216
1217         status = acpi_video_bus_POST_options(video, &options);
1218         if (ACPI_SUCCESS(status)) {
1219                 if (!(options & 1)) {
1220                         printk(KERN_WARNING PREFIX
1221                                "The motherboard VGA device is not listed as a possible POST device.\n");
1222                         printk(KERN_WARNING PREFIX
1223                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1224                 }
1225                 printk("%lx\n", options);
1226                 seq_printf(seq, "can POST: <integrated video>");
1227                 if (options & 2)
1228                         seq_printf(seq, " <PCI video>");
1229                 if (options & 4)
1230                         seq_printf(seq, " <AGP video>");
1231                 seq_putc(seq, '\n');
1232         } else
1233                 seq_printf(seq, "<not supported>\n");
1234       end:
1235         return 0;
1236 }
1237
1238 static int
1239 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1240 {
1241         return single_open(file, acpi_video_bus_POST_info_seq_show,
1242                            PDE(inode)->data);
1243 }
1244
1245 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1246 {
1247         struct acpi_video_bus *video = seq->private;
1248         int status;
1249         unsigned long id;
1250
1251
1252         if (!video)
1253                 goto end;
1254
1255         status = acpi_video_bus_get_POST(video, &id);
1256         if (!ACPI_SUCCESS(status)) {
1257                 seq_printf(seq, "<not supported>\n");
1258                 goto end;
1259         }
1260         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1261
1262       end:
1263         return 0;
1264 }
1265
1266 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1267 {
1268         struct acpi_video_bus *video = seq->private;
1269
1270
1271         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1272
1273         return 0;
1274 }
1275
1276 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1277 {
1278         return single_open(file, acpi_video_bus_POST_seq_show,
1279                            PDE(inode)->data);
1280 }
1281
1282 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1283 {
1284         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1285 }
1286
1287 static ssize_t
1288 acpi_video_bus_write_POST(struct file *file,
1289                           const char __user * buffer,
1290                           size_t count, loff_t * data)
1291 {
1292         int status;
1293         struct seq_file *m = file->private_data;
1294         struct acpi_video_bus *video = m->private;
1295         char str[12] = { 0 };
1296         unsigned long opt, options;
1297
1298
1299         if (!video || count + 1 > sizeof str)
1300                 return -EINVAL;
1301
1302         status = acpi_video_bus_POST_options(video, &options);
1303         if (!ACPI_SUCCESS(status))
1304                 return -EINVAL;
1305
1306         if (copy_from_user(str, buffer, count))
1307                 return -EFAULT;
1308
1309         str[count] = 0;
1310         opt = strtoul(str, NULL, 0);
1311         if (opt > 3)
1312                 return -EFAULT;
1313
1314         /* just in case an OEM 'forgot' the motherboard... */
1315         options |= 1;
1316
1317         if (options & (1ul << opt)) {
1318                 status = acpi_video_bus_set_POST(video, opt);
1319                 if (!ACPI_SUCCESS(status))
1320                         return -EFAULT;
1321
1322         }
1323
1324         return count;
1325 }
1326
1327 static ssize_t
1328 acpi_video_bus_write_DOS(struct file *file,
1329                          const char __user * buffer,
1330                          size_t count, loff_t * data)
1331 {
1332         int status;
1333         struct seq_file *m = file->private_data;
1334         struct acpi_video_bus *video = m->private;
1335         char str[12] = { 0 };
1336         unsigned long opt;
1337
1338
1339         if (!video || count + 1 > sizeof str)
1340                 return -EINVAL;
1341
1342         if (copy_from_user(str, buffer, count))
1343                 return -EFAULT;
1344
1345         str[count] = 0;
1346         opt = strtoul(str, NULL, 0);
1347         if (opt > 7)
1348                 return -EFAULT;
1349
1350         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1351
1352         if (!ACPI_SUCCESS(status))
1353                 return -EFAULT;
1354
1355         return count;
1356 }
1357
1358 static int acpi_video_bus_add_fs(struct acpi_device *device)
1359 {
1360         struct acpi_video_bus *video = acpi_driver_data(device);
1361         struct proc_dir_entry *device_dir;
1362         struct proc_dir_entry *entry;
1363
1364         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1365         if (!device_dir)
1366                 return -ENOMEM;
1367
1368         device_dir->owner = THIS_MODULE;
1369
1370         /* 'info' [R] */
1371         entry = proc_create_data("info", S_IRUGO, device_dir,
1372                                  &acpi_video_bus_info_fops,
1373                                  acpi_driver_data(device));
1374         if (!entry)
1375                 goto err_remove_dir;
1376
1377         /* 'ROM' [R] */
1378         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1379                                  &acpi_video_bus_ROM_fops,
1380                                  acpi_driver_data(device));
1381         if (!entry)
1382                 goto err_remove_info;
1383
1384         /* 'POST_info' [R] */
1385         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1386                                  &acpi_video_bus_POST_info_fops,
1387                                  acpi_driver_data(device));
1388         if (!entry)
1389                 goto err_remove_rom;
1390
1391         /* 'POST' [R/W] */
1392         acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1393         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1394                                  device_dir,
1395                                  &acpi_video_bus_POST_fops,
1396                                  acpi_driver_data(device));
1397         if (!entry)
1398                 goto err_remove_post_info;
1399
1400         /* 'DOS' [R/W] */
1401         acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1402         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1403                                  device_dir,
1404                                  &acpi_video_bus_DOS_fops,
1405                                  acpi_driver_data(device));
1406         if (!entry)
1407                 goto err_remove_post;
1408
1409         video->dir = acpi_device_dir(device) = device_dir;
1410         return 0;
1411
1412  err_remove_post:
1413         remove_proc_entry("POST", device_dir);
1414  err_remove_post_info:
1415         remove_proc_entry("POST_info", device_dir);
1416  err_remove_rom:
1417         remove_proc_entry("ROM", device_dir);
1418  err_remove_info:
1419         remove_proc_entry("info", device_dir);
1420  err_remove_dir:
1421         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1422         return -ENOMEM;
1423 }
1424
1425 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1426 {
1427         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1428
1429         if (device_dir) {
1430                 remove_proc_entry("info", device_dir);
1431                 remove_proc_entry("ROM", device_dir);
1432                 remove_proc_entry("POST_info", device_dir);
1433                 remove_proc_entry("POST", device_dir);
1434                 remove_proc_entry("DOS", device_dir);
1435                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1436                 acpi_device_dir(device) = NULL;
1437         }
1438
1439         return 0;
1440 }
1441
1442 /* --------------------------------------------------------------------------
1443                                  Driver Interface
1444    -------------------------------------------------------------------------- */
1445
1446 /* device interface */
1447 static struct acpi_video_device_attrib*
1448 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1449 {
1450         struct acpi_video_enumerated_device *ids;
1451         int i;
1452
1453         for (i = 0; i < video->attached_count; i++) {
1454                 ids = &video->attached_array[i];
1455                 if ((ids->value.int_val & 0xffff) == device_id)
1456                         return &ids->value.attrib;
1457         }
1458
1459         return NULL;
1460 }
1461
1462 static int
1463 acpi_video_bus_get_one_device(struct acpi_device *device,
1464                               struct acpi_video_bus *video)
1465 {
1466         unsigned long device_id;
1467         int status;
1468         struct acpi_video_device *data;
1469         struct acpi_video_device_attrib* attribute;
1470
1471         if (!device || !video)
1472                 return -EINVAL;
1473
1474         status =
1475             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1476         if (ACPI_SUCCESS(status)) {
1477
1478                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1479                 if (!data)
1480                         return -ENOMEM;
1481
1482                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1483                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1484                 acpi_driver_data(device) = data;
1485
1486                 data->device_id = device_id;
1487                 data->video = video;
1488                 data->dev = device;
1489
1490                 attribute = acpi_video_get_device_attr(video, device_id);
1491
1492                 if((attribute != NULL) && attribute->device_id_scheme) {
1493                         switch (attribute->display_type) {
1494                         case ACPI_VIDEO_DISPLAY_CRT:
1495                                 data->flags.crt = 1;
1496                                 break;
1497                         case ACPI_VIDEO_DISPLAY_TV:
1498                                 data->flags.tvout = 1;
1499                                 break;
1500                         case ACPI_VIDEO_DISPLAY_DVI:
1501                                 data->flags.dvi = 1;
1502                                 break;
1503                         case ACPI_VIDEO_DISPLAY_LCD:
1504                                 data->flags.lcd = 1;
1505                                 break;
1506                         default:
1507                                 data->flags.unknown = 1;
1508                                 break;
1509                         }
1510                         if(attribute->bios_can_detect)
1511                                 data->flags.bios = 1;
1512                 } else
1513                         data->flags.unknown = 1;
1514
1515                 acpi_video_device_bind(video, data);
1516                 acpi_video_device_find_cap(data);
1517
1518                 status = acpi_install_notify_handler(device->handle,
1519                                                      ACPI_DEVICE_NOTIFY,
1520                                                      acpi_video_device_notify,
1521                                                      data);
1522                 if (ACPI_FAILURE(status)) {
1523                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1524                                           "Error installing notify handler\n"));
1525                         if(data->brightness)
1526                                 kfree(data->brightness->levels);
1527                         kfree(data->brightness);
1528                         kfree(data);
1529                         return -ENODEV;
1530                 }
1531
1532                 mutex_lock(&video->device_list_lock);
1533                 list_add_tail(&data->entry, &video->video_device_list);
1534                 mutex_unlock(&video->device_list_lock);
1535
1536                 acpi_video_device_add_fs(device);
1537
1538                 return 0;
1539         }
1540
1541         return -ENOENT;
1542 }
1543
1544 /*
1545  *  Arg:
1546  *      video   : video bus device
1547  *
1548  *  Return:
1549  *      none
1550  *
1551  *  Enumerate the video device list of the video bus,
1552  *  bind the ids with the corresponding video devices
1553  *  under the video bus.
1554  */
1555
1556 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1557 {
1558         struct acpi_video_device *dev;
1559
1560         mutex_lock(&video->device_list_lock);
1561
1562         list_for_each_entry(dev, &video->video_device_list, entry)
1563                 acpi_video_device_bind(video, dev);
1564
1565         mutex_unlock(&video->device_list_lock);
1566 }
1567
1568 /*
1569  *  Arg:
1570  *      video   : video bus device
1571  *      device  : video output device under the video
1572  *              bus
1573  *
1574  *  Return:
1575  *      none
1576  *
1577  *  Bind the ids with the corresponding video devices
1578  *  under the video bus.
1579  */
1580
1581 static void
1582 acpi_video_device_bind(struct acpi_video_bus *video,
1583                        struct acpi_video_device *device)
1584 {
1585         struct acpi_video_enumerated_device *ids;
1586         int i;
1587
1588         for (i = 0; i < video->attached_count; i++) {
1589                 ids = &video->attached_array[i];
1590                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1591                         ids->bind_info = device;
1592                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1593                 }
1594         }
1595 }
1596
1597 /*
1598  *  Arg:
1599  *      video   : video bus device
1600  *
1601  *  Return:
1602  *      < 0     : error
1603  *
1604  *  Call _DOD to enumerate all devices attached to display adapter
1605  *
1606  */
1607
1608 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1609 {
1610         int status;
1611         int count;
1612         int i;
1613         struct acpi_video_enumerated_device *active_list;
1614         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1615         union acpi_object *dod = NULL;
1616         union acpi_object *obj;
1617
1618         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1619         if (!ACPI_SUCCESS(status)) {
1620                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1621                 return status;
1622         }
1623
1624         dod = buffer.pointer;
1625         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1626                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1627                 status = -EFAULT;
1628                 goto out;
1629         }
1630
1631         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1632                           dod->package.count));
1633
1634         active_list = kcalloc(1 + dod->package.count,
1635                               sizeof(struct acpi_video_enumerated_device),
1636                               GFP_KERNEL);
1637         if (!active_list) {
1638                 status = -ENOMEM;
1639                 goto out;
1640         }
1641
1642         count = 0;
1643         for (i = 0; i < dod->package.count; i++) {
1644                 obj = &dod->package.elements[i];
1645
1646                 if (obj->type != ACPI_TYPE_INTEGER) {
1647                         printk(KERN_ERR PREFIX
1648                                 "Invalid _DOD data in element %d\n", i);
1649                         continue;
1650                 }
1651
1652                 active_list[count].value.int_val = obj->integer.value;
1653                 active_list[count].bind_info = NULL;
1654                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1655                                   (int)obj->integer.value));
1656                 count++;
1657         }
1658
1659         kfree(video->attached_array);
1660
1661         video->attached_array = active_list;
1662         video->attached_count = count;
1663
1664  out:
1665         kfree(buffer.pointer);
1666         return status;
1667 }
1668
1669 static int
1670 acpi_video_get_next_level(struct acpi_video_device *device,
1671                           u32 level_current, u32 event)
1672 {
1673         int min, max, min_above, max_below, i, l, delta = 255;
1674         max = max_below = 0;
1675         min = min_above = 255;
1676         /* Find closest level to level_current */
1677         for (i = 0; i < device->brightness->count; i++) {
1678                 l = device->brightness->levels[i];
1679                 if (abs(l - level_current) < abs(delta)) {
1680                         delta = l - level_current;
1681                         if (!delta)
1682                                 break;
1683                 }
1684         }
1685         /* Ajust level_current to closest available level */
1686         level_current += delta;
1687         for (i = 0; i < device->brightness->count; i++) {
1688                 l = device->brightness->levels[i];
1689                 if (l < min)
1690                         min = l;
1691                 if (l > max)
1692                         max = l;
1693                 if (l < min_above && l > level_current)
1694                         min_above = l;
1695                 if (l > max_below && l < level_current)
1696                         max_below = l;
1697         }
1698
1699         switch (event) {
1700         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1701                 return (level_current < max) ? min_above : min;
1702         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1703                 return (level_current < max) ? min_above : max;
1704         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1705                 return (level_current > min) ? max_below : min;
1706         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1707         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1708                 return 0;
1709         default:
1710                 return level_current;
1711         }
1712 }
1713
1714 static void
1715 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1716 {
1717         unsigned long level_current, level_next;
1718         if (!device->brightness)
1719                 return;
1720         acpi_video_device_lcd_get_level_current(device, &level_current);
1721         level_next = acpi_video_get_next_level(device, level_current, event);
1722         acpi_video_device_lcd_set_level(device, level_next);
1723 }
1724
1725 static int
1726 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1727                            struct acpi_device *device)
1728 {
1729         int status = 0;
1730         struct acpi_device *dev;
1731
1732         acpi_video_device_enumerate(video);
1733
1734         list_for_each_entry(dev, &device->children, node) {
1735
1736                 status = acpi_video_bus_get_one_device(dev, video);
1737                 if (ACPI_FAILURE(status)) {
1738                         ACPI_DEBUG_PRINT((ACPI_DB_WARN,
1739                                         "Cant attach device"));
1740                         continue;
1741                 }
1742         }
1743         return status;
1744 }
1745
1746 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1747 {
1748         acpi_status status;
1749         struct acpi_video_bus *video;
1750
1751
1752         if (!device || !device->video)
1753                 return -ENOENT;
1754
1755         video = device->video;
1756
1757         acpi_video_device_remove_fs(device->dev);
1758
1759         status = acpi_remove_notify_handler(device->dev->handle,
1760                                             ACPI_DEVICE_NOTIFY,
1761                                             acpi_video_device_notify);
1762         backlight_device_unregister(device->backlight);
1763         if (device->cdev) {
1764                 sysfs_remove_link(&device->dev->dev.kobj,
1765                                   "thermal_cooling");
1766                 sysfs_remove_link(&device->cdev->device.kobj,
1767                                   "device");
1768                 thermal_cooling_device_unregister(device->cdev);
1769                 device->cdev = NULL;
1770         }
1771         video_output_unregister(device->output_dev);
1772
1773         return 0;
1774 }
1775
1776 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1777 {
1778         int status;
1779         struct acpi_video_device *dev, *next;
1780
1781         mutex_lock(&video->device_list_lock);
1782
1783         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1784
1785                 status = acpi_video_bus_put_one_device(dev);
1786                 if (ACPI_FAILURE(status))
1787                         printk(KERN_WARNING PREFIX
1788                                "hhuuhhuu bug in acpi video driver.\n");
1789
1790                 if (dev->brightness) {
1791                         kfree(dev->brightness->levels);
1792                         kfree(dev->brightness);
1793                 }
1794                 list_del(&dev->entry);
1795                 kfree(dev);
1796         }
1797
1798         mutex_unlock(&video->device_list_lock);
1799
1800         return 0;
1801 }
1802
1803 /* acpi_video interface */
1804
1805 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1806 {
1807         return acpi_video_bus_DOS(video, 0, 0);
1808 }
1809
1810 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1811 {
1812         return acpi_video_bus_DOS(video, 0, 1);
1813 }
1814
1815 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1816 {
1817         struct acpi_video_bus *video = data;
1818         struct acpi_device *device = NULL;
1819         struct input_dev *input;
1820         int keycode;
1821
1822         if (!video)
1823                 return;
1824
1825         device = video->device;
1826         input = video->input;
1827
1828         switch (event) {
1829         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1830                                          * most likely via hotkey. */
1831                 acpi_bus_generate_proc_event(device, event, 0);
1832                 keycode = KEY_SWITCHVIDEOMODE;
1833                 break;
1834
1835         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1836                                          * connector. */
1837                 acpi_video_device_enumerate(video);
1838                 acpi_video_device_rebind(video);
1839                 acpi_bus_generate_proc_event(device, event, 0);
1840                 keycode = KEY_SWITCHVIDEOMODE;
1841                 break;
1842
1843         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1844                 acpi_bus_generate_proc_event(device, event, 0);
1845                 keycode = KEY_SWITCHVIDEOMODE;
1846                 break;
1847         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1848                 acpi_bus_generate_proc_event(device, event, 0);
1849                 keycode = KEY_VIDEO_NEXT;
1850                 break;
1851         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1852                 acpi_bus_generate_proc_event(device, event, 0);
1853                 keycode = KEY_VIDEO_PREV;
1854                 break;
1855
1856         default:
1857                 keycode = KEY_UNKNOWN;
1858                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1859                                   "Unsupported event [0x%x]\n", event));
1860                 break;
1861         }
1862
1863         acpi_notifier_call_chain(device, event, 0);
1864         input_report_key(input, keycode, 1);
1865         input_sync(input);
1866         input_report_key(input, keycode, 0);
1867         input_sync(input);
1868
1869         return;
1870 }
1871
1872 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1873 {
1874         struct acpi_video_device *video_device = data;
1875         struct acpi_device *device = NULL;
1876         struct acpi_video_bus *bus;
1877         struct input_dev *input;
1878         int keycode;
1879
1880         if (!video_device)
1881                 return;
1882
1883         device = video_device->dev;
1884         bus = video_device->video;
1885         input = bus->input;
1886
1887         switch (event) {
1888         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1889                 if (brightness_switch_enabled)
1890                         acpi_video_switch_brightness(video_device, event);
1891                 acpi_bus_generate_proc_event(device, event, 0);
1892                 keycode = KEY_BRIGHTNESS_CYCLE;
1893                 break;
1894         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1895                 if (brightness_switch_enabled)
1896                         acpi_video_switch_brightness(video_device, event);
1897                 acpi_bus_generate_proc_event(device, event, 0);
1898                 keycode = KEY_BRIGHTNESSUP;
1899                 break;
1900         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1901                 if (brightness_switch_enabled)
1902                         acpi_video_switch_brightness(video_device, event);
1903                 acpi_bus_generate_proc_event(device, event, 0);
1904                 keycode = KEY_BRIGHTNESSDOWN;
1905                 break;
1906         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1907                 if (brightness_switch_enabled)
1908                         acpi_video_switch_brightness(video_device, event);
1909                 acpi_bus_generate_proc_event(device, event, 0);
1910                 keycode = KEY_BRIGHTNESS_ZERO;
1911                 break;
1912         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1913                 if (brightness_switch_enabled)
1914                         acpi_video_switch_brightness(video_device, event);
1915                 acpi_bus_generate_proc_event(device, event, 0);
1916                 keycode = KEY_DISPLAY_OFF;
1917                 break;
1918         default:
1919                 keycode = KEY_UNKNOWN;
1920                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1921                                   "Unsupported event [0x%x]\n", event));
1922                 break;
1923         }
1924
1925         acpi_notifier_call_chain(device, event, 0);
1926         input_report_key(input, keycode, 1);
1927         input_sync(input);
1928         input_report_key(input, keycode, 0);
1929         input_sync(input);
1930
1931         return;
1932 }
1933
1934 static int instance;
1935 static int acpi_video_resume(struct acpi_device *device)
1936 {
1937         struct acpi_video_bus *video;
1938         struct acpi_video_device *video_device;
1939         int i;
1940
1941         if (!device || !acpi_driver_data(device))
1942                 return -EINVAL;
1943
1944         video = acpi_driver_data(device);
1945
1946         for (i = 0; i < video->attached_count; i++) {
1947                 video_device = video->attached_array[i].bind_info;
1948                 if (video_device && video_device->backlight)
1949                         acpi_video_set_brightness(video_device->backlight);
1950         }
1951         return AE_OK;
1952 }
1953
1954 static int acpi_video_bus_add(struct acpi_device *device)
1955 {
1956         acpi_status status;
1957         struct acpi_video_bus *video;
1958         struct input_dev *input;
1959         int error;
1960
1961         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1962         if (!video)
1963                 return -ENOMEM;
1964
1965         /* a hack to fix the duplicate name "VID" problem on T61 */
1966         if (!strcmp(device->pnp.bus_id, "VID")) {
1967                 if (instance)
1968                         device->pnp.bus_id[3] = '0' + instance;
1969                 instance ++;
1970         }
1971
1972         video->device = device;
1973         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1974         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1975         acpi_driver_data(device) = video;
1976
1977         acpi_video_bus_find_cap(video);
1978         error = acpi_video_bus_check(video);
1979         if (error)
1980                 goto err_free_video;
1981
1982         error = acpi_video_bus_add_fs(device);
1983         if (error)
1984                 goto err_free_video;
1985
1986         mutex_init(&video->device_list_lock);
1987         INIT_LIST_HEAD(&video->video_device_list);
1988
1989         acpi_video_bus_get_devices(video, device);
1990         acpi_video_bus_start_devices(video);
1991
1992         status = acpi_install_notify_handler(device->handle,
1993                                              ACPI_DEVICE_NOTIFY,
1994                                              acpi_video_bus_notify, video);
1995         if (ACPI_FAILURE(status)) {
1996                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1997                                   "Error installing notify handler\n"));
1998                 error = -ENODEV;
1999                 goto err_stop_video;
2000         }
2001
2002         video->input = input = input_allocate_device();
2003         if (!input) {
2004                 error = -ENOMEM;
2005                 goto err_uninstall_notify;
2006         }
2007
2008         snprintf(video->phys, sizeof(video->phys),
2009                 "%s/video/input0", acpi_device_hid(video->device));
2010
2011         input->name = acpi_device_name(video->device);
2012         input->phys = video->phys;
2013         input->id.bustype = BUS_HOST;
2014         input->id.product = 0x06;
2015         input->dev.parent = &device->dev;
2016         input->evbit[0] = BIT(EV_KEY);
2017         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2018         set_bit(KEY_VIDEO_NEXT, input->keybit);
2019         set_bit(KEY_VIDEO_PREV, input->keybit);
2020         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2021         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2022         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2023         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2024         set_bit(KEY_DISPLAY_OFF, input->keybit);
2025         set_bit(KEY_UNKNOWN, input->keybit);
2026
2027         error = input_register_device(input);
2028         if (error)
2029                 goto err_free_input_dev;
2030
2031         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2032                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2033                video->flags.multihead ? "yes" : "no",
2034                video->flags.rom ? "yes" : "no",
2035                video->flags.post ? "yes" : "no");
2036
2037         return 0;
2038
2039  err_free_input_dev:
2040         input_free_device(input);
2041  err_uninstall_notify:
2042         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2043                                    acpi_video_bus_notify);
2044  err_stop_video:
2045         acpi_video_bus_stop_devices(video);
2046         acpi_video_bus_put_devices(video);
2047         kfree(video->attached_array);
2048         acpi_video_bus_remove_fs(device);
2049  err_free_video:
2050         kfree(video);
2051         acpi_driver_data(device) = NULL;
2052
2053         return error;
2054 }
2055
2056 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2057 {
2058         acpi_status status = 0;
2059         struct acpi_video_bus *video = NULL;
2060
2061
2062         if (!device || !acpi_driver_data(device))
2063                 return -EINVAL;
2064
2065         video = acpi_driver_data(device);
2066
2067         acpi_video_bus_stop_devices(video);
2068
2069         status = acpi_remove_notify_handler(video->device->handle,
2070                                             ACPI_DEVICE_NOTIFY,
2071                                             acpi_video_bus_notify);
2072
2073         acpi_video_bus_put_devices(video);
2074         acpi_video_bus_remove_fs(device);
2075
2076         input_unregister_device(video->input);
2077         kfree(video->attached_array);
2078         kfree(video);
2079
2080         return 0;
2081 }
2082
2083 static int __init acpi_video_init(void)
2084 {
2085         int result = 0;
2086
2087
2088         /*
2089            acpi_dbg_level = 0xFFFFFFFF;
2090            acpi_dbg_layer = 0x08000000;
2091          */
2092
2093         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2094         if (!acpi_video_dir)
2095                 return -ENODEV;
2096         acpi_video_dir->owner = THIS_MODULE;
2097
2098         result = acpi_bus_register_driver(&acpi_video_bus);
2099         if (result < 0) {
2100                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2101                 return -ENODEV;
2102         }
2103
2104         return 0;
2105 }
2106
2107 static void __exit acpi_video_exit(void)
2108 {
2109
2110         acpi_bus_unregister_driver(&acpi_video_bus);
2111
2112         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2113
2114         return;
2115 }
2116
2117 module_init(acpi_video_init);
2118 module_exit(acpi_video_exit);